Does anyone else smell 'lack of breath'?

So I have asked a few friends and one person kinda agreed while most said it's weird.

What I mean is sometimes, not always, when I am in a situation where there is limited oxygen like when I workout in my small room with closed doors and windows I can feel this distinct smell.

I have noticed I smell it in situations when I am in low oxygen, not like while gasping after strong physicall extertion, but sometimes yes? Hard to explain.